Fold MSAN awareness into SkJumper.cpp.

This is preparation for removing skia_enable_jumper, making it true.

CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-Clang-GCE-CPU-AVX2-x86_64-Debug-MSAN

Change-Id: I21763ea5ebafaaddda7056176796307f1a81d722
Reviewed-on: https://skia-review.googlesource.com/8830
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed